Picking up dynamic aspx? product pages during website scan

I've just done an initial test scan on our website. It's picked up A LOT of pages, but seems to be missing certain product pages.

For example, a page like www.ourwebsite.com/Product-Category.aspx?prodid=1775 doesn't seem to have been picked up in the scan. Through the website, this product page would be brought up by doing a search for a specific part number, then clicking on the link to the product page.

How do I go about getting these kinds of pages picked up during the website scan?

Another quick question. With this software, is it possible to create a robots.txt file to allow certain URLs to be crawled but not indexed (via filtering)? Or is it only possible to prevent URLs from being crawled at all?